Heat treating apparatus



Feb. 7, 1933. R'W. HYDE HEAT TREATING APPARATUS Filed Jan. -23, 1951 3Sheets-Sheet -1 1 VENTOR. fi d W fia c. BY M q ATTORNEYS.

Feb. 7, 1933. R. w. HYDE 1,896,625 HEAT TREATING APPQAIRATUS Filed Jan.25, 1931 s Shets-Sheet 2 Feb. 7, 1933. v w HYDE 1,896,625

HEAT TREATING APPARATUS Filgd Jan. 26, 195; s Sheets-Shet 5 1 lo 25 a HI U I l [I i g i: 1: 5 h i l 'il 8 1' l I I I n I I I v I I I ATTORNEYS.

IN V EN TOR.

- Patented Feb. 7, 1933 UNITED STATES 1mm) w. min, or summr, NEW JERSEYm1 rana'rme arrana'ros Application flled lanuary 26, 1981. Serial No.511,282.

This invention relates to an apparatusfor heat treating materials, andmore particularly to an a paratus for calcining limestone and otheralEaline earth carbonates.

The invention relates to the type of apparatus in which the material toe treated is assed in a thin pervious layer through a iieating zonewhere gases heated to the calcinin temperature are caused to passdownward y through the entire layer and provides for producing the hotgases and uniformly distributing them over the layer of material undertreatment. This is accomplished by locating the burners in a portion ofthe heating zone sufiiciently remote from the material so that completecombustion is obtained before the hot gases are applied thereto. Ailurality of burners are placed along the heating zone and are adaptedto be individually controlled to permit regulation of the heatdistribution longitudinally of the apparatus.

The invention further consists in the new.

and novel features of operation and the new and original features ofconstruction and combinations of parts hereinafter set for' th andclaimed.

Although the novel features which are believed to be characteristic ofthis invention will be particularly pointed outin the claims appendedhereto, theinvention itself, as to its objects and advantages, and themanner in which it may be carried out, may be better understood byreferring to the following description taken in connection with theaccompanying drawings forming a part thereoffin which Fig. 1 is a sideelevation, partly in section, of a heat treating machine constructedinaccordance with the present invention;

' Fig. 2 is a vertical section of the machine taken along the line2-2-of Fig. 1;

Fig. 3 is a horizontal section through a per tion of the heating chambertaken along the line 33 of Fig. 2 showingthe shape of the.

inlet ports; and

- .Fi 4: is a half transverse section of a modi ed form of the devicein" which the burners are inserted from the bottom of the 0 heatingchamber.

are passed along track 11 an Like reference characters denote like partsin the several figures of the drawings.

In the following description and in the claims, various details will beidentified by specific names for convenience, but they are intended tobe as generic in theirapplication as the art will permit.

Referring to the drawings more in detail, the invention is shown asapplied to a machine comprising a plurality of pallets 10 havingperforate bottoms which are su ported on a suitable trackway 11 and areriven by a driving wheel 12 which is adapted to engage said pallets andforce the same along said trackway. Track 11 is supported on a framework13 which may be of any convenient construction and which also carries awind-box 14 which communicates with the entire under surface of saidallets' as they (i forms a comparatively tight seal for preventingescape of gases. The gases may be withdrawn through ipe 15 which extendsinto the side of windox 14 and communicates with a suitable suctionapparatus (not shown). A damper 16 may be used to re late the suctionapplied to the perforate ottoms of the pallets for drawin gasestherethrough. Any dust that may drop into the wind box may be removedthrough hinged cleanout doors 31.

For heat treatin the material in said pallets, there is provi ed aheating chamber 17 formed by a roof 18, side walls 19 and bottom members24 of refractory materiah- Said chamber overhangs thesides of thepallets asubstantial distance, and the bottom members 24 extend over thepallets sides to protect the same from the intense heat of the gaseswhich are drawn downwardly through the charge. A plurality of burners 21communicate with fan shaped ports 20 in the side walls 19 and receivefuel, such as as or oil, from a header 23. Each of said urners isprovided with a valve 22 whereby individual regulation of the burnersmay be obtained.

Said ports 20 are so located with respect to the pallets 10 that the hotgases are caused to travel a substantial distance before being appliedto said pallets. This permitscom- 1 an even distribuw entire chz'zrgc.The -oortion of the heating chamber is are pieced rovides e A section inwhich the hot bustion sire formed out of .e charge and complete comel isobtained before they sti g chamber is Q e :1 S111iJ2lDl8 rrsmework 20.26, such es reenrorced ssers in position to contact with pellets forforming esubl seal and preventing the on gases, l -eterial to he treetedmsy he to the pellets by means of hopper l ed directly above thepulposition that the pellets are thereunder prior to their pesseatingchamber U.-

sllets have passed through the are inverted and dump their with drivingwheel 12, in efrect continuous chem o; eretion of the shore describedthe msteriel such es limestone is him nermeehle leyer to the variss mypass under hop er 2?. then posses through the 1 eating 'niug beet/ed toa, celnhich are passed doom layer into Wind-hots 14-. lhe speed oftravel s so reguleted that the in the heating chamber for me to causethe coldesired extent combustion sccherge, is the rned and uniforml tothe l 1 I -polied nee I '1 he longiauc me he controls i in cert ale tomaintain his chamber at e c discharge end, cooling tendency materielthat the calcining proceeds uniformly and is complete when the pelletsemerge from the discharge of the lieutin cheinh The details of theburners have completely set forth inasmuch as th are of standardconstruction and i teinplatod that oil burners or burners may beemployed. Also the burners may be provided with suitable means forregulating the combustion therein, as for example, a suitable aircontrol 3 as Well as the fuel control valves disclosed in the form ofthe invention illustrated in Fig. 4, the construction of the machine issimilar to that of the machine illustrated in Figs. 1--3 with theexception of the burners which are arranged to direct the flame upwardlythrough base 24; instead. of horizontally through side walls 19. Theparts accordingly have been given corresponding reference numerals andthe construction may be understood hy referring to the foregoingdescription. in Fig. 4 the gases of combustion impings on the roof l8and are directed by said roof downwardly onto the bed of materialcontained on the pallets. The curvature of the roof thus aids indirecting and distributthe gases uniformly across the charge.

It will be seen that this invention provides continuous heat treatmentapparatus of the type in which hot gases are drawn through it layer ofmaterial to deliver heat thereto in which by use of snumber ofseparately regulutehle fuel burners. each projecting hot combustiongases over at comparatively small sires of the layer Wide variation inthe heat treatment is possible While maintaining uniform treatment as tothe material as a Whole. By suitable regulation of the individualburners, the heat treatment given the material at diiierent pointsWithin the chamber may be maintained the some, or may be varied Widely.For example, the burners may be adjusted to give an intense initialheating, followed by a prolonged lower temperature treatment or ennerinr; or the material may he slowly and given a final brief high:reetment, and other varieties. stood by those skilled in the s anyevent since the flow of material Y amber is uniform, all portions iii-llreceive the same hes; treetri liile oer iin novel features of theinvcntion have bee disclosed and ere pointed out in the snow i clericsit will he understood that various omissions substitutions and changeshe made by those skilled in the art Without depsrting" from the spiritof the invention.

What is c i In an sp for heat treating moteriel a he i her in which acharge of s mi" a a series of receptacles some supporting said charge ina pervious layer, said receptacles being movable successivelfy throughsaid heating chamber, a portion 0 said heating chamber overhanging saidreceptacles, and openings for burners in said overhanging portion, saidburnersbeing located a sufiicient distance from said receptacles so thatthe combustible material is completely burned before bein applied tosaid charge and whereb a uni orm transverse distribution of the li otgases is obtained.

2. In an apparatus for heat treating material, a heating chamber inwhich'a charge of material is heated, a series of receptacles havingperforate bottoms for supporting said material in apervious layer, saidreceptacles being movable successively through said heating chamber, aportion of said heating chamber overhanging said receptacles andopenings for burners in said overhanging portion, said burners beingspaced longitudinally of said chamber whereby the hot gases are appliedthroughout the length thereof.

3. In an apparatus for heat treatingmatev rial, a heating chamber inwhich said material is heated, a series of receptacles having perforatebottoms for supporting said material in a pervious layer, saidreceptacles bein movable successively through said heatmg'chamber, aportion of said heating chamber overhanging said receptacles andopenings for burners in said overhanging rtion, said burners beingspaced longitudinally of said chamber whereby the hot gases are appliedthroughout the length thereof and said burner openings being fan shapedfor spreading thegases longitudinally.

4. In an apparatus for heat treating material, a heating chamber inwhich a layer of said material is heated, a series of receptar 'cleshaving perforate bottoms for supporting said material in a perviouslayer, sa d receptacles being movable successively through said heatingchamber, a portion of said heating chamber overhanging said palletsand'having transverse burner openings extendin through the sidesthereof, said burners icing located a suflicient distance from saidreceptacles so that the fuel is 'completely burned before the productsof combustion are applied to said charge and where- .by a uniformtransverse distribution of gases is obtained.

5. In an apparatus for heat treating material, a heating chamber inwhich a charge. of said material is heated, a series of receptacleshaving perforate bottoms for supporting said material in a perviouslayer, said receptacles being movable successively through said heatingchamber, a portion of said heating chamber overhanging said pallets andhaving transverse burner openings extending through the bottom thereoffor introduc ing combustible material into said chamber, said burnersbeing located a sufiicient dis-' tance from said receptacle so that thefuel is com letely burned before the products of com ustion are appliedto said charge and whereby a uniform transverse distribution of bustiblematerial into said chamber, said.

burners being located a sufiicient distance from said receptacles sothat the fuel is completely burned before the products of combustion areapplied thereto and whereby a uniform transverse distribution of gasesis obtained. i

7. An apparatus for heat treating material comprising a heating chamberin which ,fia; charge of said material is heated, a series ofreceptacles having perforate bottoms for supporting said charge in apervious layer, said receptacles being movable successively through saidheating chamber, said heating chamber being of a substantial lengthwhereby a plurality of said receptacles-may be maintained therein andoverhanging said receptacles transversely to provide a combustionsection in which gases may be heated before they are applied to thecharge, and burners located longitudinally of the heating chamber at saced points and extending into said combustion section and spaced fromthe receptacles topermit the fuel to be com lets 1y burned out ofcontact with said 0 arge whereby an even transverse distribution of theproducts of combustion is obtained.

8. An apparatus for heat treating material comprising a heating chamberin which a. charge of said material is heated, a series of receptacleshaving perforate bottoms for sup porting said material in a perviouslayer, said receptacles being movable successively through said heatingchamber, said heating chamber being of a substantial length whereby aplurality of said receptacles may be maintained therein andoverhangingsaid rece taclestransversely on both sides to rovi e acombustion space out of contact with said charge, and having burnerslocated longitudinally of the heating chamber at spaced points andextending into said combustion space from opposite sides.

9. An apparatus for calcining limestone comprising a heating chamber inwhich a charge of limestone is heated, a series of receptacles havingperforate bottoms for supporting said material in a pervious layer, saidreceptacles being movable successively through said heating chamber,said heating chamber having base members of refractory material and aseal comprising flexible mem- 5 bers carried by said base members andcontacting with said receptacles to prevent escape of gasestherebetween.

10. An apparatus for heat treating material comprising a heating chamberin which 10 said material is heated, a series of receptacles havingperforate bottoms for supportingsaid material in a pervious layer, saidreceptacles being movable successively through said heating chamber,said heating chamber having 15 base members extending over the sides toprotect them from the intense heat of the products of combustion, and aseal comprising flexible members of heat resistant material carriedadjacent said base members and en- 2 ging said receptacles to preventleakage of ot gases.

In testimony whereof I have hereunto set my hand.

REED W. HYDE.

